He had no idea how he was going to see the Snitch in this weather; he was having enough difficulty seeing the one Bludger with which they were practising; a minute into the practice it almost unseated him and he had to use the Sloth Grip Roll to avoid it.

He and Ron headed downstairs from their dormitory, discussing Angelinas idea that they were to work on a new move called the Sloth Grip Roll during that night’s Quidditch practice, and not until they were halfway across the sunlit common room did they notice the addition to the room that had already attracted the attention of a small group of people.